Arc-lamp casing



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. ARC LAMP-CASING. 7 APPLICATION FILED APR. 28, 1916. 1,344,938. Patented June 29, 1920.

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@QOQQ To all whom it may concern:

UNITED STATES PATENT OFFICE.

IREDELL EACHUS, 0F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE MACBETH ABC LAMP COMPANY, INC., 01? PHILADELPHIA, PENNSYLVANIA, A. CORPORATION OF PENNSYLVANIA.

ARC-LAMP CASING.

Specification of Letters Patent. Patented J 29 1920 Application filed April 28, 1916. Serial No. 94,116.

Be it known that I, IREDELL EACHUS, a citizen of the United States, residing at 1248 N. 57th street, Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a certain newand useful Arc- Lamp Casing, of which the following is a specification.

The purpose of my invention is to form a compact, convenient cover or casing for an are light which shall protect fully from fire risk. i

A further purpose of my invention is to place the carbons directly in front of the operating mechanism in an are light and to fully inclose them. At the same time I render them easily and fully accessible.

A further purpose of my invention is to place are light carbons in front of the operating mechanism, feeding them toward and from each other through slots in an intervening partition, and to provide a forward draft from the portion of the casing inclosing the mechanism in order to avoid deposit of ash upon the mechanism.

A further purpose of my invention is to mount the carbons of an are light in. front of the mechanism, surrounding them by a refiector, and to provide doors inclosing the base of the reflector and the carbon holders but hinged back of the carbons.

A further purpose of my invention is to retract the pawl feeding mechanism and the tension upon the carbon carrying racks.

A further purpose of my invention is to improve the tension mechanism for the can bon feed and clutch mechanism.

A further purpose of my invention is to provide a simple, convenient and reliably resilient connection between the solenoidal core and the feeding pawl.

I have preferred to illustrate my invention by but one form thereof, selecting one which has proved in considerable use to be practical, eiiicient and very satisfactory and which at the same time well illustrates the principles of my invention.

Figure 1 shows the preferred form of my invention in perspective.

F ig. 2 is a longitudinal section through the center of the casing and reflector shown in Fig. 1.

Fig. 3 is asection of Fig. 2 taken upon the line 33.

Figs. 4 and 5 are sections of Fig. 2 upon thelines 44 and 55.

In the drawings similar numerals of reference indicate like parts.

Describing in detail the embodiment shown, but recognizing that my invention may appear in many different forms The casing is made up of two end pieces 5-5, connected by a partition 6 and a skeleton frame 7, 8, 9 and closed'at the rear between the ends by a removable, channelshaped cover member 10 and at the front between the ends by a pair of doors 1111, hinged at 12, back of the face 13 of the end sections and preferably in approximate line with .the partition 6. These, doors are held in closed position by a latch 14 and are cut away at their central section, as at 15, to fit the base 16 of a reflector 17 for the are light.

The reflector is supported independently of the doors by centrally located posts 18. carries any suitable glass screen 19, and is slotted at 20 to allow the carbons 21, 21. to pass into it. The carbon can be inserted most readily through holes 22 in the ends 5, 5, the lower of these holes being normally closed by a cover 23 to protect from fire danger.

The carbons are supported within carbon holders 24, which are here considered as including also arms 25 from which the actual holders are insulated at 26. The current is supplied to the carbon holders in series with the controlling solenoid, as at 27, 28.

.The arms 25 pass through slots at 29 and 30, in the partition 6, the metal on the two sides of the slots being turned down at right angles to the partition, as at 31 to finish opposite sides of theslots.

The arms are guided upon rods 32 and 33, supported at their ends in the casing frame structure and are fed in opposite directions by means of racks 34 and 35 rigidly connected with the arms and gear 36 engaging both racks, one on each side of the gear. The gear is secured upon a shaft 37 which carries also a ratchet wheel 38, with which pawl 39 engages.

The pawl is operated as hereinafter explained, by means of a rod 40, which passes within a solenoid winding 41 and there connects with the solenoid core which is middle leg or stem 42 of a T-shaped member whose outer legs 43 straddle the winding and give additional mass'at the same time that they follow the lines of magnetic flux from the winding and improve the magnetic circuit. One of the legs 43 engages an adjustable stop 44 mounted upon the solenoid and thus limits inward movement of the core.

The outer end of the rod 40 engages the shorter, free end 45 of a U-shaped spring 46 which near its bend passes through and thus hinges in one side 47 of a rocker frame pivoted upon shaft 37. This frame is completed by a second side 48 and counterweight 49, the latter being of such proportions and so placed as to neutralize the weight of the rod, core, etc. of the ratchetoperating mechanism and render its operation uniform in all positions of the lamp. Between the end 45 of spring 46 and the point at which the spring engages the side plate 47 there is considerable free length of spring wire to afford a resilient connection reducing the ar of the feed. Pressure upon the shorter end 45 of the spring 46 causes lateral movement of the entire Ushaped spring, moving the longer end 50 in slots 51, 52 in the side plate 48 and in the reversclyturned end 53 of this plate, respectively, so as to press against a lever 54 upon the pawl 39. The pawl is pivoted upon the shaft 55 fixed at one end in the main part of plate 48 and its other end in the reversely turned part 53 of this plate. The lower part of the pawl is provided with an arm 56, which, as the rod 40 is drawn farther into the solenoid engages with a stop 57 to release the pawl from the ratchet wheel.

In order to retract the solenoid core and bring the pawl back when the current is reduced in or withdrawn from the solenoid winding, one of the side arms 47 of the rocker frame is connected, as by rod 58, wi h the outer end of a spiral spring 59 and the opposite (here inner) end of this spiral spring is used to draw the carbons toward each other normally. This is accomplished by securing the inner end of the spiral spring to an axially-fixed oscillatory shaft 60 with which swings a segment arm 61, which takes up or releases a chain 62 connected to the segment at 63 at one end and to the rack 35 at the other.

Movements of the entire feed mechanism are damped by a dash pot 64 connected at one end to the counterweight and at the other end to the lamp casing.

Because of the-tendency of ash from the arc to deposit upon adjacent parts and the objections to having this ash deposited upon the operating mechanism, I have arranged to provide an excess of inlet air at the lower part of mechanism compartment 65 of my lamp, as ordinarily used (Fig. 2) without corresponding exit for the .air naturally heated therein in order that there may be a draft of air from this compartment 65 into the compartment 66, in front of partition 6, through the slots 29 and 30 and have provided additional exit openings for air from this compartment (36 to take care of the heated air in this front compartment and the draft from the rear compartment. While I recognize that this might be accom plished by a great variety of proportions and locations of inlet and exit air openings, I have illustrated one form which has given great satisfaction in operation, in which I have provided inlet openings at 67, along the front portion of the lower part of the removable rear section of my frame entering compartment 65 below the middle there of, with outlet openings at the upper part of the back of this removable section at 68 and have provided restricted inlet openings below the middle of the doors, as at 69, with much larger area of outlet openings in the upper portions of these doors, as at 70 and in the upper end of the casing, as at 71. I have also provided ventilation, as at 72, 73 and 74 in the reflector.

In operation, the carbons are struck and the additional current passing through the solenoid causes the T-shaped core to be drawn within the solenoid forcing the rod forward resiliently against the tension of the outer end of the spiral spring. The outer end of the rod engages the free shorter end of the U-shaped spring, pressing the pawl downwardly against the ratchet wheel by the engagement of the other end of this spring with the arm upon the pawl and then swinging the rock frame. This turns the ratchet wheel 38 in a counter-clockwise direction in Fig. 2, causing the racks and hence the carbons to be moved in opposite directions against the tension of the other end of the spiral. spring. When the carbons have separated sufficiently to reduce the flow of current through the solenoid, they will reach a point of equilibrium at which the pull upon the solenoid will. be

balanced against the tension of the spiral spring at one end upon the pawl frame and at the other end upon the racks.

During operation, the air enters more freely through the openings in the lower part of the mechanism compartment than it can leave through the openings in the upper part of this compartment, exclusive of the slots, resulting in a constant flow of heated air through the two slots 29 and 30, preventing deposit of ash upon the mechanism. This is facilitated by a relatively larger exit for air from the upper part of the front compartment than inlet to the lower part of this compartment.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is i. In a casing for are lamps, top and bottom end casing members, a partition joining the members, and rear and side casing members forming with the partition and the rear of the end members a mechanism compartment, in front of which the arc is adapted to be maintained in combination with doors of angular cross section, having their front planes when closed in approxi' mately the plane of the fronts of the end members and pivoted back of said plane.

2. In a casing for are lamps, top and bottom end members, a partition joining said members in front of which the are is adapted to be maintained, removable rear and side members forming with the partition and rear of the end members, a mechanism compartment back of the partition and doors pivoted at the sides to close in front of the partition to inclose the arc.

3. In an are light casing, end casing members, a partition between said end casing members, a reflector frame mounted rigidly with respect to the partition and end members and adapted to receive the carbons of the lamp, side and rear casing members K forming with the end members and partition a rear mechanism compartment and doors of angular cross section having their front portions adapted to close against the reflector frame at a distance in front of the partition and hinges for said doors to the rear of the closed position of the fronts of said doors.

4. In an are light casing, end casing members, a partition connecting the same at a point between the front and back faces of the end members, rear and side casing members, with the end members and partition forming a mechanism compartment, a frame stiffening the end and partition structure and doors hinged approximately in the plane of the partition and adapted to close in front of said partition to form a front compartment in connection with the forwardly projecting portions of the ends.

5. In an are light casing, end casing mem bers, a partition connecting the same, rear and side casing members with the end members and partition forming a mechanism compartment, a frame stiffening the end and partition structure, doors hinged approximately in the plane of the partition and adapted to close in front of said partition to form a front compartmentin connection with the forwardly projecting portions of the ends and a reflector frame rigidly connected with the stiffening frame and engaged by the doors in their closed position.

6. In a device of the character stated, an

arc lamp compartment having back, side and end walls and a front wall longitudinally slotted toward the ends above and below the center, carbon holders passing through the slots and operating mechanism contained within the casing, the casing having relatively excessive air inlet in its lower part as compared with its upper part, adapted to cause part of the air admitted to pass out of the casing through the slots.

7. In a device of the character stated, a casing having a front compartment for the carbons and within which the arc is maintained and a rear mechanism compartment and a partition between the compartments, the partition being slotted longitudinally above and below the center, carbon holders passing through the slots, carbons carried by the holders, and mechanism back of the partition in the rear compartment adapted to operate the lamp, the rear compartment having excessive air inlet in its lower part as compared with air outlet in its upper part and the front compartment having relatively excessive air outlet in its upper part as compared with air inlet at its lower part, whereby air heated in the rear compartment is caused to flow from the rear to the front compartment through the slots and out through the front compartment.

8. In a device of the character stated, a casing having end members, and a rear Wall, side walls and a longitudinal partition extending between the end members, the partition lying in a plane between the front and rear planes of the end members to form a rear mechanism compartment and being slotted longitudinally above and below the center, doors adapted to close between the end members in front of the partition to form with the end members a front compartment, carbon holders passing through the slots, carbons carried by the holders, and mechanism back of the partition in the rear compartment adapted to operate the lamp, the rear compartment having excessive air inlet in its lower part as compared with air outlet in its upper part and the front compartment having relatively excessive air outlet in its upper part as compared with air inlet at its lower part, whereby air heated in the rear compartment is caused to flow from the rear to the front compartment through the slots and out through the front compartment.

IREDELL EACHUS.

Witnesses:

WM. STEELL JACKSON, J. LUTI-IERIA KAUFFMAN. 

